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Subject[PATCH 2/2] umem: fix up unplugging
Date
In that patch, Jens removed the whole mm_unplug_device()
function, which used to be the trigger to make umem start to work.

We need to implement unplugging to make umem start to work, or I/O
will never be triggered.

Signed-off-by: Tao Guo <Tao.Guo@emc.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@vger.kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>
---
drivers/block/umem.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index aa27120..89cc9a6 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -513,6 +513,15 @@ static void process_page(unsigned long data)
}
}

+static void mm_unplug(struct blk_plug_cb *cb)
+{
+ struct cardinfo *card = cb->q->queuedata;
+
+ spin_lock_irq(&card->lock);
+ activate(card);
+ spin_unlock_irq(&card->lock);
+}
+
static void mm_make_request(struct request_queue *q, struct bio *bio)
{
struct cardinfo *card = q->queuedata;
@@ -523,6 +532,8 @@ static void mm_make_request(struct request_queue *q, struct bio *bio)
*card->biotail = bio;
bio->bi_next = NULL;
card->biotail = &bio->bi_next;
+ if (bio->bi_rw & REQ_SYNC || !blk_check_plugged(q, mm_unplug))
+ activate(card);
spin_unlock_irq(&card->lock);

return;
--
1.7.7.6


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